We discuss changes in the electronic structure and the topography of the graphite surface caused by a single ion impact. Both protrusion-like regions (PLR) and the latticedisordered regions were found in scanning tunneling microscope images. In atomic force images, however, no PLRs were found, even in when lattice-disordered regions were found. To determine the change in the density of states in PLRs, tunneling current versus voltage characteristics were measured. It was found that the density of states at the Fermi level of PLRs was greater than that of the intact surface, which means that the semimetal to metal transition was caused by a single ion impact. These results indicate that PLRs may originate from the change in the density of states.
|Journal||Applied Physics A: Materials Science and Processing|
|Issue number||SUPPL. 1|
|Publication status||Published - 1998 Dec 1|
ASJC Scopus subject areas
- Materials Science(all)